新型固体电解质Ce_(5.2)RE_(0.8)MoO_(15-δ)的合成及电性质  

Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce_(5.2)RE_(0.8)MoO_(15-δ)

作　　者：周德凤[1] 郭微[2] 葛志敏[2] 郝险峰[1] 柴平[1] 曹学强[1] 邢献然[3] 孟健[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理重点实验室,长春130022 [2]长春工业大学生物工程学院,长春130012 [3]北京科技大学物理化学系,北京100083

出　　处：《高等学校化学学报》2007年第2期220-223,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20271049;20331030)资助

摘　　要：采用溶胶-凝胶方法合成了系列新型氧化物Ce5.2RE0.8MoO15-δ(RE=Ce,Y,La,Sm,Gd,Dy,Ho,Er).通过XRD,Ram an和XPS等手段对氧化物的结构进行了表征,采用交流阻抗谱测试其导电性能.研究结果表明,RE3+的掺杂可增加氧离子的空位浓度,改善母体电导率,晶胞参数随RE3+半径的增大而增大.掺杂离子Dy3+的半径(0.0908 nm)与母体基质离子Ce4+的半径(0.0920 nm)相近,形成的掺杂氧化物晶格弹性应变最小,RE3+与氧空位间的缔合焓(ΔHA)最小,因而氧化物Ce5.2Dy0.8MoO15-δ具有相对较高的电导率(7.02×10-3S/cm)和较低的激活能(1.056 eV).A series of solid state electrolytes,Ces. 2RE0. 8MoO15 -δ （RE =Y, La, Sin, Gd, Dy, Ho, Er）, were synthesized by sol-gel method. Their structures and electrical conductivities were characterized by X-ray Diffraction（ XRD）, Raman and X-ray Photoelectron Spectroscopy （XPS） and AC impedance spectroscopy, respectively. The results show that the concentrations of oxygen vacancy increased with increasing x and their conductivity were improved. And the cell parameters increase as the radius of RE^3＋ increases. Because the ionic radius of doped Dy^3＋ （0. 0908 nm） is closed to that of Ce^4＋ （0. 0920 nm）, their oxide has minimal cell elastic straining between RE^3 ＋ and oxygen vacancy, and the system has the least association enthalpy, thus the oxide Ce5.2 Dy0.8 MoO15-δ exhibits a higher conductivity （7.02 × 10^-3 S/cm） and lower activation energy （ 1. 056 eV） compared to the other doped compounds.

关 键 词：固体电解质 电导率 溶胶-凝胶法 固体氧化物燃料电池 

分 类 号：O614.33[理学—无机化学]